KR101004907B1 - A linear vibrator and electronic device including the same - Google Patents

Abstract

PURPOSE: A linear vibrator and an electronic device thereof are provided to decrease the contact impact between a magnetic field part and a coil by arranging a coil damping part between the coil and a magnet. CONSTITUTION: A magnetic field part(20) comprises a yoke(22) and a magnet(24). The yoke is arranged inside a housing(10). The magnet is installed in one side of the yoke. The magnetic field part vibrates from the internal space of the housing by interacting with the coil. An elastic member interlinks the yoke and the housing. The elastic member elastically supports the magnetic field part inside the housing. A magnetic flux focusing part(60) focuses a magnetic flux from the magnetic field part.

Description

Linear vibrator and electronic device including the same

The present invention relates to a linear vibrator and an electronic device including the same, and to a linear vibrator and an electronic device including the same, which can prevent the occurrence of residual vibration generated during an impact and quickly eliminate it.

The linear vibrator is a component that converts electrical energy into mechanical vibration by using an electromagnetic force generation principle. The linear vibrator is mounted on an electronic device such as a mobile communication terminal and a game machine, and is used for silent call notification and vibration transmission.

Recently, mobile communication terminals have been miniaturized and slimmed, and linear oscillators mounted thereon have also been miniaturized and highly functionalized.

In the internal space of a conventional linear vibrator, a vibrator and a stator which vibrate in an electromagnetic relationship are disposed.

Since the internal parts constituting the vibrator and the stator are provided with high density in the internal space, interference between the internal parts occurs due to the vibration of the vibrator.

In addition, when an impact is applied to the linear vibrator, the vibrator suspended in the internal space repeatedly generates contact and non-contact with other components, thereby causing residual vibration.

Therefore, there is a need for a study on a linear vibrator capable of eliminating residual vibration even when the internal space is densified.

An object of the present invention is to be fixed to one side of the coil that is supported by the elastic member to provide a vibration space of the vibrating magnet, to provide a linear vibrator comprising a magnetic piece for concentrating the magnetic flux of the magnetic fluid provided between the magnet and the coil It is.

Another object of the present invention is to provide an electronic device on which the linear vibrator is mounted.

Linear vibrator according to an embodiment of the present invention comprises a housing forming an inner space; A magnetic field unit having a yoke disposed in the inner space and a magnet magnetized on one surface of the yoke and vibrating in the inner space by interaction with a coil to which power is applied; An elastic member connecting the yoke and the housing to allow the magnetic field to be elastically supported on the inner space; And a magnetic flux focusing unit focusing the magnetic flux of the magnetic field unit and moving the magnetic field unit in a direction in which the coil is disposed.

In addition, the linear oscillator according to an embodiment of the present invention is provided between the coil and the magnet, the coil damping unit to mitigate the impact generated by the magnetic field portion and the coil contact by the magnetic action of the magnetic flux focusing unit; It may further include.

In addition, the coil damping unit of the linear oscillator according to an embodiment of the present invention may include a magnetic fluid band formed along the outer surface of the magnet.

In addition, the coil of the linear vibrator according to an embodiment of the present invention is wound so that the space in which the magnetic field is vibrated to move is formed, the magnetic flux focusing portion may be provided in the coil.

In addition, the magnetic flux collecting part of the linear vibrator according to an embodiment of the present invention may include a metal piece, and may be adhesively fixed to one upper side or inner circumferential surface of the coil.

In addition, the coil of the linear vibrator according to an embodiment of the present invention has a cylindrical shape to form a space in which the magnetic field portion vibrates and moves, the magnetic flux focusing portion is formed of a plurality of metal pieces formed in an annular rim fixed to the coil It may include.

In addition, the magnetic flux focusing part of the linear vibrator according to an embodiment of the present invention may include magnetic powder, and may be adhesively fixed to one upper side or inner circumferential surface of the coil.

In addition, the magnetic flux focusing portion of the linear vibrator according to an embodiment of the present invention includes a magnetic liquid, and may be fixed to one upper side or inner circumferential surface of the coil.

In addition, the coil of the linear vibrator according to an embodiment of the present invention has a cylindrical shape to form a space in which the magnetic field is vibrated to move, the magnetic flux focusing portion may be coupled to one side of the coil.

In addition, the yoke of the linear vibrator according to an embodiment of the present invention is a magnet fixing portion to which the magnet is fixed, a weight fixing portion to be bent in the magnet magnetizing direction in the magnet fixing portion is fixed to the weight body is fixed and the It may include a claw which is bent at the weight fixing portion to support the bottom of the weight.

In addition, the housing of the linear vibrator according to an embodiment of the present invention may include a cylindrical upper case portion having a lower opening and a bracket for sealing the lower portion of the upper case portion and magnetizing the coil.

In addition, the magnetic field of the linear vibrator according to an embodiment of the present invention may further include a yoke plate that is fixed to the opposite surface of the contact surface that the yoke of the magnet is in contact with each other to prevent magnetic leakage.

In addition, the linear vibrator according to an embodiment of the present invention may include a bracket damper on one surface of the housing to prevent the magnetic field portion from contacting the housing by vibration.

On the other hand, the linear oscillator according to another embodiment of the present invention is a cylindrical upper case of which the lower opening; A bracket fixed to an open lower portion of the upper case to form an inner space, and to which a coil to which external power is applied is fixed; A magnetic field unit having a yoke disposed in the inner space, a magnet magnetized on one surface of the yoke, and a yoke plate formed on an opposite surface of a contact surface to which the yoke of the magnet contacts, the magnetic field unit vibrating in a space in the coil; An elastic member connecting the upper case and the yoke so that the magnetic field is elastically supported in the internal space; And a magnetic flux focusing part for focusing the magnetic flux so that the balance of the magnetic flux flow to the coil of the magnetic field part is broken, and provided on a portion of the upper or inner surface of the coil.

In addition, the linear vibrator according to an embodiment of the present invention is provided along the outer surface of the magnet, the magnetic fluid band to mitigate the impact caused by the magnetic field portion and the coil contact by the magnetic action of the magnetic flux focusing unit; It may further include.

In addition, the magnetic flux collecting part of the linear vibrator according to an embodiment of the present invention may include a metal piece adhesively fixed to the coil.

In addition, the magnetic flux focusing part of the linear vibrator according to an embodiment of the present invention includes a plurality of metal pieces formed in an annular rim portion fixed to the coil, and the metal pieces may generate an eccentricity of magnetic flux flow.

In addition, the magnetic flux collecting part of the linear vibrator according to an embodiment of the present invention may include magnetic powder that is adhesively fixed to the coil.

In addition, the magnetic flux collecting part of the linear vibrator according to an embodiment of the present invention may include a magnetic liquid applied and fixed to the coil.

In addition, the magnetic flux collecting part of the linear vibrator according to an embodiment of the present invention may include a metal piece that is tightly coupled to one side of the coil.

In addition, the yoke of the linear vibrator according to an embodiment of the present invention is a magnet fixing portion to which the magnet is fixed, a weight fixing portion to be bent in the magnet magnetizing direction in the magnet fixing portion is fixed to the weight body is fixed and the It may include a claw which is bent at the weight fixing portion to support the bottom of the weight.

In addition, the linear vibrator according to an embodiment of the present invention may further include a bracket damper provided on the bracket to prevent the magnetic field portion from contacting the bracket by vibration.

In another aspect, an electronic device according to an embodiment of the present invention includes a linear oscillator; A circuit board on which the linear vibrator is mounted; And an electronic device case including the circuit board in an internal space.

According to the linear vibrator according to the present invention, when the vibration is generated in the vibrator (magnetic field) suspended in the inner space by the external impact, the vibrating magnetic field can be contacted to one side of the coil, so that the residual vibration generated in the magnetic field can be quickly Can be removed.

In addition, when there is an external impact, the residual vibration is quickly removed, thereby reducing noise and providing reliability in durability by reducing interference with counterpart parts.

In addition, when the magnetic fluid is injected therebetween in order to alleviate the impact with the counterparts interfering with the magnetic field part, the residual focus can be reduced by the magnetic flux focusing part. You can.

In addition, since the application amount of the magnetic fluid can be reduced, the characteristics related to the vibration amount of the vibrator can be improved.

1 is a schematic perspective view showing a partially cut linear oscillator according to an embodiment of the present invention.
2 is a schematic cross-sectional view of the linear vibrator of FIG. 1.
3 is an enlarged cross-sectional view of a portion A of FIG. 2.
4 is a plan view of the linear vibrator of FIG. 1 without the upper case and the magnetic field;
5 is a schematic perspective view of an elastic member according to an embodiment of the present invention.
6 is a plan view of a linear vibrator in which a first modification of the magnetic flux focusing portion provided in the coil is shown;
7 is an enlarged cross-sectional view of a portion A of FIG. 2 in which a second modification of the magnetic flux focusing portion provided to the coil is shown.
8 is an enlarged cross-sectional view of a portion A of FIG. 2 in which a third modification of the magnetic flux focusing portion provided to the coil is shown;
9 is a schematic cross-sectional view illustrating a phenomenon in which magnetic flux generated in the magnetic field unit is concentrated to the magnetic flux focusing unit.
10 is a schematic exploded perspective view of an electronic device including a linear vibrator according to an embodiment of the present invention.

Hereinafter, with reference to the drawings will be described in detail a specific embodiment of the present invention. However, the spirit of the present invention is not limited to the embodiments presented, and those skilled in the art who understand the spirit of the present invention may deteriorate other inventions or the present invention by adding, modifying, or deleting other elements within the scope of the same idea. Other embodiments that fall within the scope of the inventive concept may be readily proposed, but they will also be included within the scope of the inventive concept.

In addition, the components with the same functions within the scope of the same idea shown in the drawings of each embodiment will be described using the same reference numerals.

Linear oscillator

1 is a schematic perspective view showing a partially cut linear oscillator according to an embodiment of the present invention, Figure 2 is a schematic cross-sectional view of the linear oscillator of Figure 1, Figure 3 is an enlarged cross-sectional view of the portion A of FIG. 4 is a plan view of the linear vibrator of FIG. 1 without the upper case and the magnetic field, and FIG. 5 is a schematic perspective view of an elastic member according to an exemplary embodiment of the present invention.

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1 to 5, the linear vibrator 1 according to the exemplary embodiment of the present invention may include a housing 10, a magnetic field part 20, an elastic member 40, and a magnetic flux focusing part 60. have.

The housing 10 may have an internal space in which internal components constituting the vibrator are disposed. The housing 10 may be implemented in various ways, and in particular, the housing 10 should be easily arranged and assembled.

The housing 10 of the present exemplary embodiment may include a cylindrical upper case part 12 having a lower opening and a bracket 14 sealing the lower part of the upper case part 12 and magnetizing the coil 50. .

The printed circuit board 52 may be mounted on the bracket 14, and the printed circuit board 52 may be made of a flexible printed circuit board (FPCB).

The printed circuit board 52 may include a connection terminal 56 through which the linear vibrator 1 may be connected to the circuit board 110 of the electronic device 100 (FIG. 10).

The magnetic field unit 20 may include a yoke 22 and a magnet 24 that generate a magnetic field of a predetermined intensity and are disposed in an inner space of the housing 10. The magnet 24 is engaged with the yoke plate 26 to prevent magnetic leakage on the opposite surface of the contact surface to which the yoke 22 contacts.

The yoke 22 may have a cylindrical shape in which the upper part is sealed and the lower part is open. In detail, the magnet fixing part 222 to which the magnet 24 is fixed and the weight fixing part to be bent in the magnet 24 magnetizing direction from the magnet fixing part 222 to fix the weight body 30 ( 224 and the weight fixing portion 224 may include a claw portion 226 supporting the bottom of the weight body 30.

The yoke 22 and the magnet 24 may be fixed by bonding the magnet 24 to one surface of the yoke 22.

The diameter of the inner circumferential surface of the yoke 22 is larger than the diameter of the outer circumferential surface of the magnet 24, and a predetermined size air gap AG is formed between the inner circumferential surface of the yoke 22 and the outer circumferential surface of the magnet 24. Can be formed.

A coil 50 may be disposed between the air gaps AG so that the current flows in the magnetic field formed by the magnetic field unit 20 so that the magnetic field unit 20 vibrates.

The coil 50 may have a cylindrical shape to form a space in which the magnetic field unit 20 moves. That is, the coil 50 may be wound to form a space in which the magnetic field unit 20 vibrates and moves. In addition, the gap between the magnetic field unit 20 and the coil 50 may include a coil damping unit 80 to mitigate an impact during mutual contact between the magnetic field unit 20 and the coil 50 due to an external impact. Can be.

The coil damping unit 80 may be a magnetic fluid strip 82 formed along an outer surface of the magnet.

A bracket damper 55 may be formed on an upper surface of the bracket 14 to prevent the magnetic field part 20 from contacting the housing 10 by vibration. The bracket damper 55 may be changed in various shapes, and the material may be rubber.

The elastic member 40 may be a spring member such as a leaf spring or a coil spring. The elastic member 40 has a housing fixing part 42 fixed to one surface of the upper case 12, and a yoke fixing part 46 which is in surface contact with the other surface of one surface to which the magnet 24 of the yoke 22 contacts. And a plurality of connection strips 44 arranged to form an elastic space 45 between the housing fixing part 42 and the yoke fixing part 46.

The housing fixing part 42 is a fixed end of the elastic member 40 fixed to the housing 10 which is not vibrated, and the yoke fixing part 46 is an elastic member vibrating by the vibration of the magnetic field part 20 ( 40) is the free end.

Among the upper and lower portions of the elastic member 40, the magnetic field portion 20 installed at the free end of the elastic member 40 contacts the upper surface of the elastic member 40 by vibration. At least one upper case damper 43 may be installed.

The upper case damper 43 may include a magnetic fluid and may be fixed to the upper surface of the elastic member 40 by the leakage magnetic flux of the magnet 24.

The yoke fixing portion 46 is a flat disc, the housing fixing portion 42 is an annular rim with an open center, and the connecting strip portion 44 is the yoke fixing portion 46 and the housing fixing portion ( 42 may have a spiral shape.

The magnetic flux focusing part 60 may focus the magnetic flux of the magnetic field part 20, and allow the magnetic field part 20 to move in the direction of the coil 50. That is, the magnetic flux focusing part 60 prevents the magnetic flux flow between the magnetic field part 20 and the coil 50 from being balanced, and the balance of the magnetic flux flow from the magnetic field part 20 to the coil 50 is broken. The magnetic flux of a part of the magnetic field unit 20 may be focused.

9 is a schematic cross-sectional view illustrating a phenomenon in which magnetic flux generated in the magnetic field unit is concentrated to the magnetic flux focusing unit. Referring to FIG. 9, the magnetic flux concentration may be more clearly understood by the magnetic flux focusing unit 60 provided on the coil 50 of the magnetic field unit 20.

Since the magnetic flux focusing part 60 may be installed anywhere on a location surface that affects the magnetic flux of the magnetic field part 20, the magnetic flux focusing part 60 may be installed using a separate member in the internal space or may exist outside the magnetic field part 20. It may be installed on.

Here, the magnetic flux focusing part 60 may be provided on a part of the upper or inner surface of the coil 50 existing outside the magnetic field part 20.

1 to 4 may be a metal piece 62 formed on one side of the upper portion of the coil 50. The metal piece 62 may be fixed with an adhesive to prevent separation from the coil 50.

In addition, by using a flexible metal sheet can be adhesively fixed to the inner peripheral surface of the coil (50).

Modified example of the magnetic flux focusing part

FIG. 6 is a plan view of a linear vibrator in which a first modification of the flux focusing portion provided to the coil is shown, and FIG. 7 is an enlarged cross-sectional view of part A of FIG. 2, in which a second modification of the flux focusing portion provided to the coil is shown, FIG. 8. Is an enlarged cross-sectional view of part A of FIG. 2 in which a third modification of the magnetic flux focusing portion provided to the coil is shown.

6 may be a plurality of metal pieces 62 formed on an annular rim 64 fixed to the coil 50. The rim 64 may be fixed to the coil 50 with an adhesive or have other fastening means.

Here, the metal pieces 62 may be disposed on the rim 64 at uniform or non-uniform intervals. The metal piece 62 may generate an eccentricity of magnetic flux flow from the magnetic field part 20 to the coil 50.

The magnetic flux focusing part 60 of the embodiment of FIG. 7 may be a metal piece 65 formed by bending both sides thereof to be pressed against the coil 50.

In addition, the metal piece 65 may also be fixed with the coil 50 and an adhesive for firm coupling.

The magnetic flux focusing part 60 of the embodiment of FIG. 8 may include a magnetic liquid 66 applied and fixed to the coil 50. The magnetic liquid 66 may be an adhesive mixture that acts as a binder on the magnetic powder, but is not limited thereto.

In addition, the magnetic flux focusing unit 60 may be fixed to the coil 50 using only magnetic powder.

Electronics

10 is a schematic exploded perspective view of an electronic device including a linear vibrator according to an embodiment of the present invention.

The internal configuration of the linear vibrator 1 according to an embodiment of the present invention can be applied not only to a structure such as a speaker requiring vibration, but also to various electronic devices requiring vibration.

Referring to FIG. 10, an electronic device 100 according to an embodiment of the present invention may include a linear vibrator 1, an outer case 120, and a circuit board 110.

The linear vibrator 1 may be mounted on the circuit board 110 disposed in the inner space of the outer case 120 in various ways, and the connection terminal 56 and the circuit board of the linear vibrator 1 may be mounted on the circuit board 110. The connection terminal 112 of 110 may be connected to exchange signals.

1: linear oscillator 10: housing
20: magnetic field portion 40: elastic member
30: weight 50: coil
60: magnetic flux focusing part

Claims (23)

A housing forming an inner space;
A magnetic field unit having a yoke disposed in the inner space and a magnet magnetized on one surface of the yoke and vibrating in the inner space by interaction with a coil to which power is applied;
An elastic member connecting the yoke and the housing to allow the magnetic field to be elastically supported on the inner space; And
And a magnetic flux focusing part focusing the magnetic flux of the magnetic field part and moving the magnetic field part in a direction in which the coil is arranged.
The method of claim 1,
And a coil damping part provided between the coil and the magnet and configured to mitigate an impact generated by contact between the magnetic field part and the coil by the magnetic action of the magnetic flux focusing part.
The method of claim 2,
The coil damping unit linear oscillator including a magnetic fluid band formed along the outer surface of the magnet.
The method of claim 1,
The coil is wound to form a space in which the magnetic field vibrates and moves,
The magnetic flux focusing part is provided on the coil.
The method of claim 1,
The magnetic flux collecting part includes a metal piece, and is linearly fixed to an upper one side or an inner circumferential surface of the coil.
The method of claim 1,
The coil has a cylindrical shape such that a space for vibrating and moving the magnetic field is formed.
The magnetic flux focusing portion includes a linear vibrator including a plurality of metal pieces formed on an annular rim portion fixed to the coil.
The method of claim 1,
The magnetic flux collecting part includes magnetic powder and is linearly fixed to the upper one side or the inner circumferential surface of the coil.
The method of claim 1,
The magnetic flux collecting part includes a magnetic liquid and is fixed to the upper one side or the inner circumferential surface of the coil.
The method of claim 1,
The coil has a cylindrical shape such that a space for vibrating and moving the magnetic field is formed.
The magnetic flux focusing portion is a linear vibrator coupled to one side of the coil.
The method of claim 1,
The yoke is a magnet fixing part to which the magnet is fixed, a weight body fixing part to be formed in the direction in which the magnet is magnetized in the magnet fixing part and the weight body is fixed and a bent formed in the weight body fixing part to the bottom of the weight body Linear vibrator comprising a claw for supporting.
The method of claim 1,
The housing is a linear vibrator, characterized in that it comprises a cylindrical upper case portion having a lower opening and a bracket for sealing the lower portion of the upper case portion and the coil magnetized.
The method of claim 1,
The magnetic field unit further includes a yoke plate which is fixed to an opposite surface of a contact surface to which the yoke of the magnet is in contact and prevents magnetic leakage.
The method of claim 1,
The housing is a linear vibrator, characterized in that it comprises a bracket damper to prevent the magnetic field portion from contacting the housing by vibration.
A cylindrical upper case with a lower opening;
A bracket fixed to an open lower portion of the upper case to form an inner space, and to which a coil to which external power is applied is fixed;
A magnetic field unit having a yoke disposed in the inner space, a magnet magnetized on one surface of the yoke, and a yoke plate formed on an opposite surface of a contact surface to which the yoke of the magnet contacts, the magnetic field unit vibrating in a space in the coil;
An elastic member connecting the upper case and the yoke so that the magnetic field is elastically supported in the internal space; And
And a magnetic flux concentrator configured to focus the magnetic flux so that the balance of the magnetic flux flows into the coil of the magnetic field unit, and is provided on a portion of the upper or inner surface of the coil.
The method of claim 14,
And a magnetic fluid band provided along an outer surface of the magnet and configured to mitigate an impact generated by contact between the magnetic field part and the coil by magnetic action of the magnetic flux focusing part.
The method of claim 14,
The magnetic flux focusing part includes a linear vibrator adhesively fixed to the coil.
The method of claim 14,
The magnetic flux collecting part includes a plurality of metal pieces formed on an annular rim fixed to the coil,
The metal piece is a linear oscillator to generate the eccentricity of the magnetic flux flow.
The method of claim 14,
The magnetic flux collecting part includes a linear vibrator including magnetic powder that is adhesively fixed to the coil.
The method of claim 14,
The magnetic flux focusing part includes a linear oscillator including a magnetic liquid applied and fixed to the coil.
The method of claim 14,
The magnetic flux focusing unit includes a linear vibrator including a metal piece that is tightly coupled to one side of the coil.
The method of claim 14,
The yoke is a magnet fixing part to which the magnet is fixed, a weight body fixing part to be formed in the direction in which the magnet is magnetized in the magnet fixing part and the weight body is fixed and a bent formed in the weight body fixing part to the bottom of the weight body Linear vibrator comprising a claw for supporting.
The method of claim 14,
And a bracket damper provided on the bracket to prevent the magnetic field part from contacting the bracket by vibration.
23. The linear vibrator of any one of claims 1 to 22;
A circuit board on which the linear vibrator is mounted; And
And an electronic device case including the circuit board in an internal space.

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